2 * Copyright (c) 2011 Aeroflex Gaisler
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include <asm-leon/leon.h>
27 #include <asm-leon/leonstack.h>
28 #include <asm-leon/asmmacro.h>
33 /* Number of register windows */
34 .global _nwindows_min1, _nwindows
36 ! Window overflow trap handler on save.
39 .weak _window_overflow
40 .set _window_overflow,__window_overflow
41 .weak _window_overflow_svt
42 .set _window_overflow_svt,__window_overflow_svt
44 !.global _window_overflow,_window_overflow_svt
45 .global __window_overflow_rettseq,__window_overflow_rettseq_ret,__window_overflow_slow1
47 __window_overflow_svt:
50 __window_overflow_rettseq:
51 mov %wim, %l3 ! Calculate next WIM
55 __window_overflow_rettseq_ret:
56 sethi %hi(_nwindows_min1), %l4 ! NWINDOWS-1
57 ld [%l4+%lo(_nwindows_min1)], %l4
62 save ! Get into window to be saved.
73 restore ! Go back to trap window.
76 jmp %l1 ! Re-execute save.
80 __window_overflow_slow1: ! space for possible stackcheck patch
85 __window_overflow_rettseq:
86 __window_overflow_rettseq_ret:
87 __window_overflow_slow1:
93 /* Window underflow trap handler on restore. */
97 .weak _window_underflow
98 .set _window_underflow,__window_underflow
99 .weak _window_underflow_svt
100 .set _window_underflow_svt,__window_underflow_svt
102 !.global _window_underflow,_window_underflow_svt
104 __window_underflow_svt:
107 mov %wim, %l3 ! Calculate next WIM
110 sethi %hi(_nwindows_min1), %l5 ! NWINDOWS-1
111 ld [%l5+%lo(_nwindows_min1)], %l5
117 restore ! Two restores to get into the
118 restore ! window to restore
119 ldd [%sp + 0], %l0; ! Restore window from the stack
127 save ! Get back to the trap window.
129 jmp %l1 ! Re-execute restore.